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dc.contributor.authorKvittem, Marit Irene
dc.contributor.authorMoan, Torgeir
dc.date.accessioned2014-11-27T14:54:01Z
dc.date.accessioned2016-05-13T11:13:39Z
dc.date.available2014-11-27T14:54:01Z
dc.date.available2016-05-13T11:13:39Z
dc.date.issued2015
dc.identifier.citationMarine Structures 2015, 40:38-59nb_NO
dc.identifier.issn0951-8339
dc.identifier.urihttp://hdl.handle.net/11250/2389427
dc.description.abstractLong term time domain analysis of the nominal stress for fatigue as- sessment of the tower and platform members of a three-column semi- submersible was performed by fully coupled time domain analyses in Simo- Ri ex-AeroDyn. By combining the nominal stress ranges with stress con- centration factors, hot spot stresses for fatigue damage calculation can be obtained. The aim of the study was to investigate the necessary simulation duration, number of random realisations and bin sizes for the discretisa- tion of the joint wind and wave distribution. A total of 2316 3-hour time domain simulations, were performed. In mild sea states with wind speeds between 7 and 9 m/s, the tower and pontoon experienced high fatigue damage due to resonance in the rst bending frequency of the tower from the tower wake blade passing frequency (3P). Important fatigue e ects seemed to be captured by 1 hour simulations, and the sensitivity to number of random realisations was low when run- ning simulations of more than one hour. Fatigue damage for the tower base converged faster with simulation duration and number of random realisations than it did for the platform members. Bin sizes of 2 m/s for wind, 1 s for wave periods and 1 m for wave heights seemed to give acceptable estimates of total fatigue damage. It is, however, important that wind speeds that give coinciding 3P and tower resonance are included and that wave periods that give the largest pitch motion are included in the analysis.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.titleTime domain analysis procedures for fatigue assessment of a semi-submersible wind turbinenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.date.updated2014-11-27T14:54:01Z
dc.source.volume40nb_NO
dc.source.journalMarine Structuresnb_NO
dc.identifier.doi10.1016/j.marstruc.2014.10.009
dc.identifier.cristin1177758
dc.description.localcode© 2014 Elsevier Ltd. All rights reserved. This is the authors' accepted and refereed manuscript to the article. Locked until 2017-01-01 due to the copyright restriction.nb_NO


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